Mobile Phones > Samsung How to Clear Cache on a Samsung S9 Fix performance issues on your smartphone by freeing up memory By Molly McLaughlin Molly McLaughlin Twitter Senior Content Strategist New York University Molly K. McLaughlin has been a technology writer since 2004. Her work has appeared on many tech sites across the web including PCMag, Dealnews, Wirecutter and many others. lifewire's editorial guidelines Updated on May 12, 2021 Reviewed by Ryan Perian Reviewed by Ryan Perian Western Governors University Ryan Perian is a certified IT specialist who holds numerous IT certifications and has 12+ years' experience working in the IT industry support and management positions. lifewire's editorial guidelines Tweet Share Email Tweet Share Email Samsung Samsung Quick Tips What to Know Free up memory: Open Settings > Device care > Memory > Clean now.Clear app cache: Open Settings > Apps > select an app > Storage > Clear cache.Clear system cache: Power off the phone > boot it up into Recovery mode > Wipe Cache Partition > Yes > Reboot System Now. This article explains how to clear the app and system cache on a Samsung Galaxy S9 or S9+ smartphone to fix various issues, including slowed down performance. How to Free Up Memory Using Device Care If your device is sluggish or your apps aren’t functioning correctly, you can free up memory on your device by closing apps running in the background. Open Settings. Scroll down to Device care. Tap Memory. Tap Clean now. After cleaning, the screen will display how much memory is now available. How to Clear App Cache on the Galaxy S9 Or S9+ You can clear an app’s cache if it’s giving you trouble, etc. Clearing the cache on an app is like doing so in a web browser. It’s good to do this if the cache is full or has outdated information messing with the app’s performance. Open Settings. Go to Apps. Select an app. Tap Storage. Tap Clear cache. You can also select Clear data in some apps, but only if you want to permanently delete stored information like files, settings, and login credentials. How to Clear the System Cache on the Galaxy S9 Using Recovery Mode Android devices that shipped with Android 6.0 or older download and store system updates in the system cache. Then, it applies them when you reboot. Phones that shipped with Android 7.0 and later have a more efficient system. It’s a good idea to clear the system cache after updating your smartphone to get rid of outdated files and data. Power off your Galaxy S9 or Galaxy S9 Plus. Press and hold the Volume Up, Power, and Bixby buttons simultaneouslyuntil the Android logo appears and the phone vibrates. Release the buttons. Use the Volume buttons to scroll down and highlight the WipeCache Partition option. Press the Power button to select it. You'll see a warning explaining this action can't be undone. Scroll down to Yes with the Volume button, and select it with the Power button. Navigate to the Reboot System Now option and press the Power button to select it. The Galaxy S9 should reboot with a cleared system cache. Clear Cache on Your Samsung S10 to Resolve App or System Issues Was this page helpful? Thanks for letting us know! Get the Latest Tech News Delivered Every Day Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up. There was an error. Please try again. Thank you for signing up! Tell us why! Other Not enough details Hard to understand Submit